Technical data

FUEL SYSTEM
Fuel from the fuel tank is drawn to the engine by means of an engine mounted 12 volt electric
fuel pump/filter. It is also filtered by an engine mounted secondary fuel filter and delivered to the fuel
injection pump. The injection pump then delivers a portion of the fuel to each injector through the
connecting injection lines where the injector sprays the fuel into the combustion chamber for ignition.
The remaining fuel carrying heat with it is returned to the tank through the fuel return system.
(1) Fuel Filter
The fuel filter encloses the paper element with high filtering efficiency and is provided with one
air vent screw.
(2) Fuel Pump
This is the electromagnetic (transistor type) fuel
pump, which uses reciprocation of a plunger
under the control of the transistor circuit. The
hollow plunger is actuated by the oscillator which
encloses the transistor, diode, resistor, etc. When
the transistor is "ON", the exited solenoid coil
attracts the plunger downward against the spring,
thus allowing fuel to push the outlet valve to open
the passage through which the ful is led into the
plunger. When the transistor is turned to "OFF",
the plunger is pushed upward by the spring, thus
the fuel in the plunger is forced to flow out of the
outlet port. At the same time, the inlet valve
opens to suck fuel into the cavity under the
plunger.
(1) Diaphragm (6) Plunger
(2) Oscillator (7) Outlet Valve
(3) Solenoid coil (8) Spring
(4) Filter (9) Inlet Valve
(5) Filter cover
Fuel Pump
(3) Fuel Injection Pump
This built-in type cylinder injection pump is mounted on the right hand side of the cylinder
block. It consists of the pump elements (plunger assemblies), delivery valves, tappets, smoke
set unit, etc. As the pump camshaft rotates, the plungers are moved up and down through the
fixed stroke, delivering fuel to each cylinder's injector.